Евклидăн параллеллĕх аксиоми
Евклидăн параллеллĕх аксиоми е пиллĕкмĕш постулат — классикăлла планиметри никĕсĕнче выртакан аксиомăсенчен пĕри.

Вуламалли 
Carroll, Lewis, Euclid and His Modern Rivals, Dover, ISBN 0-486-22968-8
Faber, Richard L. (1983), Foundations of Euclidean and Non-Euclidean Geometry, New York: Marcel Dekker Inc., ISBN 0-8247-1748-1
Henderson, David W.; Taimiņa, Daina (2005), Experiencing Geometry: Euclidean and Non-Euclidean with History (3rd ed.), Upper Saddle River, NJ: Pearson Prentice Hall, ISBN 0-13-143748-8
Katz, Victor J. (1998), History of Mathematics: An Introduction, Addison-Wesley, ISBN 0-321-01618-1, OCLC 38199387
Rozenfeld, Boris A. (1988), A History of Non-Euclidean Geometry: Evolution of the Concept of a Geometric Space, Springer Science+Business Media, ISBN 0-387-96458-4, OCLC 15550634
Smith, John D. (1992), "The Remarkable Ibn al-Haytham", The Mathematical Gazette, Mathematical Association, 76 (475): 189–198, doi:10.2307/3620392, JSTOR 3620392

Каçăсем
 On Gauss' Mountains

Геометри
Евклид геометрийĕ